To reset the SMC on an iMac inch Mid
1. From the Apple menu, choose Shut Down or if the computer is not responding, hold the power button for approximately ten seconds until it powers off . 2. Unplug all cables from the computer, including the power cord. 3. Wait at least 15 seconds. The SMC reset occurs automatically once the iMac has been unplugged from the AC power source for several seconds. 4. Plug the power cord back in, making sure the power button is not being pressed at the time. 5. Reconnect your keyboard and mouse to...
Loud fan noise coming from inside the computer
The iMac 20-inch Mid 2007 has a trio of fans that circulate air throughout the system. It also includes temperature sensors, and advanced thermal software that spins the fans fast or slow as needed. As the system usage increases, the fans will adjust their speed using advanced thermal software to meet the cooling needs of the system. Under normal conditions, rotating fans will make a slight hum that varies in relationship with their rotational speed and the amount of air that they are moving....
Audio quality is poor
The camera is recognized but the built-in microphone's audio quality is poor. 1. Open the System Preferences window and click on Sound. - Verify that the built-in camera has been selected as the sound input port. - Verify that the input volume settings are appropriate. Use the volume level meter to verify settings. 2. Open iMovie and create a new project. Click on the Audio button and record a sound sample. Is the sound quality acceptable Yes The microphone is functioning normally. The audio...
Replacing the Optical Drive
Caution Never press down on or grasp the body of the optical drive when installing it. Pressing or squeezing the body of the optical drive could damage the drive mechanism. 1. Connect the optical sensor cable to the underside of the drive. Place a new foam gasket on top of the sensor clip. Note Replace the foam gasket when installing a replacement optical drive. A new foam gasket is included with replacement optical and hard drives. 2. Install the flex cable onto the optical drive with two T6...
Replacing the Bluetooth Card
1. Connect the Bluetooth antenna to the Bluetooth card. 2. Press the Bluetooth card onto the logic board connector. 3. Replace the two Bluetooth card screws. 5. Clean and replace the glass panel. Note This step is very important. Follow the procedures to ensure the glass is clean and free of particles.
Replacing the Inverter Cable
1. Place the inverter cover over the inverter board. 2. Connect the inverter power cable to the inverter board. 3. Tuck metal tabs on the left side of the inverter cover under the chassis. 4. Line up the screws hole and attach the two inverter screws to the rear housing. 6. Lower the LCD display panel into the rear housing. 7. Connect the inverter cable to the panel. Tuck the four inverter cables into the open cavities in the rear housing. If the cables are not tucked into the open areas next...
Cleaning Tool Resources
1. MCM Portal http www.mcmb2b.com appleasp 2. iKlear distributors iKlear International dealer listing iKlear US Canada dealer listing 3. Japan Pleiades Digital Communications, Inc.www.pleiadesdesigns.co.jp 4. Brillianize is an alternative cleaning solution http www.brillianize.com Brillianize products are listed here Brillianize dealer locator The micro fiber terry style cleaning cloth can be purchased directly from iKlear or Brillianze An optional tool used to detect dust and contamination is...
Replacing the Stand
1. Align the pins on the clutch mechanism to the holes in the stand. 11. Clean and replace the glass panel. Note This step is very important. Follow the procedures to ensure the glass is clean and free of particles.
Part Location Alh
1. At the top, peel back the EMI tape that grounds the exposed part of the camera cable to the chassis. . 2. Remove the three pieces of clear Kapton tape securing the cable to the rear housing. 3. Near the middle of the rear housing, remove the two T8 screws on the cable guide. 3. Near the middle of the rear housing, remove the two T8 screws on the cable guide.
Removing the Display Panel
1. Place the computer with the display face up. 2. Remove the two T6 screws from the LVDS connector. Pull the black tab on the LVDS cable to disconnect it from the logic board. 3. Remove the eight 8-mm long T8 screws from the sides of the panel frame. 4. Disconnect the display sensor cable from the connector on the left side of the logic board. 4. Disconnect the display sensor cable from the connector on the left side of the logic board. 5. Grasp the LCD panel at the bottom edge, and tilt up...
Removing the AC Power Inlet
1. Note the routing of the AC power inlet cable under the chassis frame. Using a torx T10 screwdriver, remove the three 7mm long self-tapping screws from the power inlet and the 5-mm long machine screw from the ground cable . Remove any EMI tape on the metal case. 4. Remove the four mechanism screws. 5. Remove the remaining chassis screws. Note The three screws 11mm along the top, countersink into the chassis. 6. To the left of the opening for the stand is a black plastic cable guide. Remove...
Diagnostic LEDs
The iMac 20-inch 2007 has four built-in diagnostic LEDs on the main logic board that can help you to troubleshoot the computer. The four LEDs are located to the right of the memory slot, under the hard drive data cable. It may be necessary to carefully remove the hard drive data cable to view the LEDs. It may be necessary to carefully remove the hard drive data cable to view the LEDs. Indicates that the trickle voltage from the power supply has been detected by the main logic board. This LED...
Replacing the LVDS Cable
1. Connect the LVDS cable to the rear of the display panel. 2. Replace the tape over the LVDS cable connector. 3. With the LVDS cable connected to the back of the display panel, lower the display panel into the rear housing. 4. Tuck the four inverter cables into the open cavities in the rear housing. If the cables are not tucked into the open areas between the optical drive and the optical fan and above the optical drive, the LCD panel will not lower into place correctly making proper...
Part Location Mch
1. Remove the two T6 screws from IR board and disconnect the IR cable from the logic board. 2. Lift the IR board from the heatsink. 1. If removed, connect the IR cable to the IR board. 2. Install the two T6 screws from IR board and connect the IR cable to the logic board. 4. Clean and replace the glass panel. Note This step is very important. Follow the procedures to ensure the glass is clean and free of particles.
Replacing the Camera Cable
1. Route the camera cable into the rear housing as shown below. 2. At the top, replace the piece of EMI tape grounding the camera cable to the chassis 2. At the top, replace the piece of EMI tape grounding the camera cable to the chassis 3. Replace the three pieces of Kapton tape onto the rear housing. 3. Replace the three pieces of Kapton tape onto the rear housing. 4. Replace the T8 screws on the black plastic cable holder. 4. Replace the T8 screws on the black plastic cable holder. 5....
Cant hear sound from the speakers
1. Disconnect any external microphones, speakers, or headphones. 2. Access System Preferences and select Sound. In the Sound pane, select Output and make sure the Internal speakers are selected as the device for sound output, the Output volume is adequate, and Mute is not selected. Do you have sound now Yes Problem resolved. No Go to the next step. 3. Reset parameter RAM. Press Command-Option-P-R during startup but before Welcome to Macintosh appears. Do you have sound now Yes Problem resolved....
Metal Alignment Pins on the Glass Panel
There are alignment pins at the top of the glass panel near the camera, one pin at the bottom near the IR remote sensor, and a pin on the left and right side of the glass. Important If the glass is removed from the bezel at an angle, the metal alignment pins may bend, causing scratches on the inside of the glass and possibly requiring replacement of the glass panel. The glass panel has a thin silver ferrous metal band affixed to the perimeter which is magnetically attracted to the fourteen...
Discs wont insert
1. Make sure that when inserting a disc, to use a continuous motion to push the disc into the drive. Keep pushing the disc until your finger touches the side of the iMac. 1. Is there a disc already in the drive Yes Eject the disc before inserting another. Refer to Knowledge Base article 51008 - iMac If You Can't Eject a CD or DVD, or Open the Drive Tray If none of these options will eject the disc, you may have to disassemble the drive to recover the disc. See Knowledge Base article 86382 -...
Part Location Kwz
1. Disconnect the ambient temperature sensor cable from the logic board, and remove the left speaker if you haven't done so already. 2. Disconnect the ambient temperature sensor cable from the left speaker. 3. Use a black stick to remove the sensor from the adhesive on the side of the speaker. 1. Attach the temp sensor to the left speaker. Connect the temperature sensor cable to the sensor. Replace the left speaker and speaker screw. 2. Connect the temperature sensor cable to the logic board...
Replacing the AC Power Inlet
1. Position the AC power inlet cable in between the DC Power cable and the black tabs in the rear housing. 2. Replace T8 screw on the cable clip securing the AC inlet. Reapply any clear kapton tape. 2. Replace T8 screw on the cable clip securing the AC inlet. Reapply any clear kapton tape. Install the AC power inlet into the chassis, feeding the green ground cable through the opening in the chassis. Secure the short ground cable with a machine screw. Push the AC inlet cable into the white...
Handling a Broken Glass Panel
The glass panel is not tempered and will break into sharp pieces if mishandled. If the glass is broken it must be carefully removed from the iMac to prevent irreparable damage to the front surface of the LCD. If the front surface of the LCD is scratched by the broken glass the LCD may need to be replaced. Do not handle broken glass unless you are wearing protective cut-resistant gloves. The lint-free gloves used to prevent contamination of the glass panel are not suitable for handling broken...
Replacing the Left Speaker
1. Install the speaker in the rear housing. Secure the left speaker with the longer of the two speaker mounting screws. Route the speaker cable under the tab on the CPU fan and under the black cable holder. 2. Connect the ambient temp sensor cable to the left side of the logic board. 3. Connect the speaker cable to the audio board. Route the cable under the black cable holder above the memory slot . 6. Clean and replace the glass panel. Note This step is very important. Follow the procedures to...
Replacing the Power Supply Cable
1. Install the power supply cable into the rear housing as shown below. Position the cable between the black guide posts on the rear housing. 2. Replace any Kapton tape securing the cable to the rear housing. 5. Replace the pressure wall and screws. 13. Clean and replace the glass panel. Note This step is very important. Follow the procedures to ensure the glass is clean and free of particles.
Removing the Optical Drive Fan
1. With a black stick, pry off the metal clip covering the optical cable connector. 2. Disconnect the optical cable connector from the audio board. 3. Disconnect the fan cable from the logic board to the right of the optical cable connector . Lift the fan off the guide posts on the rear housing. Lift the fan off the guide posts on the rear housing.
Imac G4 Video Card Replace
1. Remove the three screws and disconnect the cable from the logic board. 2. Tilt up the video card with attached heatsink, and disconnect it from the card connector on the logic board as shown with the iMac 24-inch video card. 3. When handling the video card, hold it by the heat pipe brace as demonstrated on the previous iMac model video card. 1. Connect the video card to the logic board, lining up the gold fingers on the card with the video card slot on the logic board. 2. Install the three...
Imac Microphone Location
1. Place the computer on a soft protective lint-free surface such as a very clean ESD mat to avoid damaging the finish on the stand or rear housing. 2. Position the computer on the rear cover with the stand facing you. 3. Remove the twelve screws around the bezel. Replacement Note The four longer screws 25mm attach along the bottom of the panel. 4. With the upper corners loosened, lift up but do not remove the bezel. 4. With the upper corners loosened, lift up but do not remove the bezel. 5....
Part Location
1. Disconnect all cables and the power cord from your iMac. 2. Place a soft, clean towel or cloth on your work surface. Hold the side of the iMac and lay it down so that the screen is against the surface and the bottom is facing you. 3. Raise the stand and use a Phillips 2 screwdriver to loosen the captive screw on the memory access door by turning it counterclockwise. Important When removing and installing the RAM access door it is important that you use the correct size Phillips screwdriver....
silicone roller over the inside of the glass Note If fingerprints and oils are
12. Holding the glass by the edges, carefully line up the metal pins on the inside of the glass panel with the holes at the top of the front bezel and the hole at the bottom of the bezel. Gently lower the glass panel onto the bezel. The magnets on the front bezel will pull panel and hold the glass panel in place. 13. Clean the outside of the glass panel with a clean microfiber cleaning cloth. If necessary, spray a small amount two pumps of iKlear polish on the outside of the glass panel. Wipe...
Removing the DC Power Supply Cable
1. Remove the right pressure wall and its two machine screws from the chassis. 2. Remove the eight chassis screws and AC ground screw. 2. Remove the eight chassis screws and AC ground screw. 3. Remove the chassis from the rear housing. 4. Remove any kapton tape securing the DC power cable to the rear housing. 5. Remove the T8 screw on the cable guide. 6. Remove any tape securing the cable to the rear housing. 7. Lift the DC power cable out of the rear housing. Note the cable routing between the...
Optical disc constantly ejects
1. Disconnect all peripheral devices, especially the mouse in cases where the disc is constantly ejecting. Retest. If the issue is resolved, reconnect peripherals one-at-a-time until faulty peripheral is identified. 2. Try cleaning the disc. If the disc is dirty or scratched, it may not mount. Is the issue resolved No Try a different disc. If the issue persists, go on to the next step. Boot from Apple Service Diagnostic disc version 3S116. Does the unit pass the tests Yes Restart to the...
When I type strange characters appear on the screen
1. Depending on your iMac's settings, a simple keystroke can change your keyboard from English to Japanese. This can result in some pretty funny characters showing up when you type. To switch to the US keyboard, 3. Click on the International icon. 4. Click on the Input Menu near the top of the screen. 5. Scroll down the list and uncheck any non-US keyboard layouts. 6. Close the System Preferences. Try typing a few characters. Did is solve the problem Yes Problem solved.
Screw Chart Page of
AC power inlet to chassis ground 1 Front bezel, along bottom of LCD 4 , 25mm
Required Special Tools
Special tools are required to remove, handle, and clean the glass panel such as the following. These are available as a starter kit too. View the tools in the Glass Panel take apart chapter. 1. 922-8252 Suction cups, Pkg. of 2 2. 922-8261 Sticky silicone roller 6-inch to clean the glass panel 3. 922-8262 Sticky sheet pads to clean the silicone roller 4. 922-8263 Polishing cloths, clean, anti-static, optical grade micro fiber terry style cloth 5. 922-8253 Gloves, lint-free, anti-static, Pkg. of...
iMac inch Mid Lower Exploded View
Cable, -Ambient Temp Sensor 922-8191 - Logic Board 661-4437, 2.0 GHz 661-4439, 2.4 GHz Cable, AC DC SATA Power Inverter 922-8188 Cable, AC DC SATA Power Inverter 922-8188 661-4424 1 GB, DDR2 667, SO-DIMM 661-4225 2 GB, DDR2, 667, SO-DIMM
iMac inch Mid Upper Exploded View
- Hard Drive 661-4387, 250 GB 661-4388, 320 GB 661-4389, 500 GB 661-4390, 750 GB Cable, Optical Flex, DATA 922-8192
Flashing question mark or an alternating question mark and Mac OS face or a
Note When troubleshooting hard drive problems it is a good idea, if possible, to back up any important data. Some troubleshooting steps may require erasing the contents of the hard drive. 1. Boot from the system CD that came with the computer, and open Disk Utility. Does the hard drive show in Disk Utility Yes Run Repair Disk and Repair Permissions to correct any directory and permissions issues. Go on to Step 2. No Go to Step 3. 2. Did Disk Utility successfully repair directory or permissions...